If our original scenario is:
Scenario 0: 25 1-hour meetings over the course of a few days. Investments = 25-n
You seemed to be suggesting in an earlier comment you might end up with:
Scenario 1: 25 20-minute meetings followed by 25 1-hour meetings. Investments = 25-n
I think you'll actually end up with:
Scenario 2: 25 20-minute meetings, eliminate x companies, (25-x) 1-hour meetings. Investments = (25-x)-n.
Saves you and the founders some unnecessary hour long meetings.